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Diffstat (limited to 'frontends/windows/bitmap.c')
-rw-r--r-- | frontends/windows/bitmap.c | 387 |
1 files changed, 387 insertions, 0 deletions
diff --git a/frontends/windows/bitmap.c b/frontends/windows/bitmap.c new file mode 100644 index 000000000..664244838 --- /dev/null +++ b/frontends/windows/bitmap.c @@ -0,0 +1,387 @@ +/* + * Copyright 2008 Vincent Sanders <vince@simtec.co.uk> + * Copyright 2009 Mark Benjamin <netsurf-browser.org.MarkBenjamin@dfgh.net> + * + * This file is part of NetSurf, http://www.netsurf-browser.org/ + * + * NetSurf is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; version 2 of the License. + * + * NetSurf is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +/** + * \file + * win32 implementation of the bitmap operations. + */ + +#include "utils/config.h" + +#include <inttypes.h> +#include <sys/types.h> +#include <string.h> +#include <windows.h> + +#include "utils/log.h" +#include "image/bitmap.h" +#include "desktop/plotters.h" +#include "content/content.h" + +#include "windows/plot.h" +#include "windows/bitmap.h" + +/** + * Create a bitmap. + * + * \param width width of image in pixels + * \param height width of image in pixels + * \param state a flag word indicating the initial state + * \return an opaque struct bitmap, or NULL on memory exhaustion + */ +void *win32_bitmap_create(int width, int height, unsigned int state) +{ + struct bitmap *bitmap; + BITMAPV5HEADER *pbmi; + HBITMAP windib; + uint8_t *pixdata; + + LOG("width %d, height %d, state %u", width, height, state); + + pbmi = calloc(1, sizeof(BITMAPV5HEADER)); + if (pbmi == NULL) { + return NULL; + } + + pbmi->bV5Size = sizeof(BITMAPV5HEADER); + pbmi->bV5Width = width; + pbmi->bV5Height = -height; + pbmi->bV5Planes = 1; + pbmi->bV5BitCount = 32; + pbmi->bV5Compression = BI_BITFIELDS; + + pbmi->bV5RedMask = 0xff; /* red mask */ + pbmi->bV5GreenMask = 0xff00; /* green mask */ + pbmi->bV5BlueMask = 0xff0000; /* blue mask */ + pbmi->bV5AlphaMask = 0xff000000; /* alpha mask */ + + windib = CreateDIBSection(NULL, (BITMAPINFO *)pbmi, DIB_RGB_COLORS, (void **)&pixdata, NULL, 0); + + if (windib == NULL) { + free(pbmi); + return NULL; + } + + bitmap = calloc(1 , sizeof(struct bitmap)); + if (bitmap == NULL) { + DeleteObject(windib); + free(pbmi); + return NULL; + } + + bitmap->width = width; + bitmap->height = height; + bitmap->windib = windib; + bitmap->pbmi = pbmi; + bitmap->pixdata = pixdata; + if ((state & BITMAP_OPAQUE) != 0) { + bitmap->opaque = true; + } else { + bitmap->opaque = false; + } + + LOG("bitmap %p", bitmap); + + return bitmap; +} + + +/** + * Return a pointer to the pixel data in a bitmap. + * + * The pixel data is packed as BITMAP_FORMAT, possibly with padding at the end + * of rows. The width of a row in bytes is given by bitmap_get_rowstride(). + * + * \param bitmap a bitmap, as returned by bitmap_create() + * \return pointer to the pixel buffer + */ +static unsigned char *bitmap_get_buffer(void *bitmap) +{ + struct bitmap *bm = bitmap; + if (bitmap == NULL) { + LOG("NULL bitmap!"); + return NULL; + } + + return bm->pixdata; +} + + +/** + * Find the width of a pixel row in bytes. + * + * \param bitmap a bitmap, as returned by bitmap_create() + * \return width of a pixel row in the bitmap + */ +static size_t bitmap_get_rowstride(void *bitmap) +{ + struct bitmap *bm = bitmap; + + if (bitmap == NULL) { + LOG("NULL bitmap!"); + return 0; + } + + return (bm->width) * 4; +} + + +/** + * Free a bitmap. + * + * \param bitmap a bitmap, as returned by bitmap_create() + */ +void win32_bitmap_destroy(void *bitmap) +{ + struct bitmap *bm = bitmap; + + if (bitmap == NULL) { + LOG("NULL bitmap!"); + return; + } + + DeleteObject(bm->windib); + free(bm->pbmi); + free(bm); +} + + +/** + * Save a bitmap in the platform's native format. + * + * \param bitmap a bitmap, as returned by bitmap_create() + * \param path pathname for file + * \param flags flags controlling how the bitmap is saved. + * \return true on success, false on error and error reported + */ +static bool bitmap_save(void *bitmap, const char *path, unsigned flags) +{ + return true; +} + + +/** + * The bitmap image has changed, so flush any persistant cache. + * + * \param bitmap a bitmap, as returned by bitmap_create() + */ +static void bitmap_modified(void *bitmap) { +} + +/** + * Sets whether a bitmap should be plotted opaque + * + * \param bitmap a bitmap, as returned by bitmap_create() + * \param opaque whether the bitmap should be plotted opaque + */ +static void bitmap_set_opaque(void *bitmap, bool opaque) +{ + struct bitmap *bm = bitmap; + + if (bitmap == NULL) { + LOG("NULL bitmap!"); + return; + } + + LOG("setting bitmap %p to %s", bm, opaque ? "opaque" : "transparent"); + bm->opaque = opaque; +} + + +/** + * Tests whether a bitmap has an opaque alpha channel + * + * \param bitmap a bitmap, as returned by bitmap_create() + * \return whether the bitmap is opaque + */ +static bool bitmap_test_opaque(void *bitmap) +{ + int tst; + struct bitmap *bm = bitmap; + + if (bitmap == NULL) { + LOG("NULL bitmap!"); + return false; + } + + tst = bm->width * bm->height; + + while (tst-- > 0) { + if (bm->pixdata[(tst << 2) + 3] != 0xff) { + LOG("bitmap %p has transparency", bm); + return false; + } + } + LOG("bitmap %p is opaque", bm); + return true; +} + + +/** + * Gets whether a bitmap should be plotted opaque + * + * \param bitmap a bitmap, as returned by bitmap_create() + */ +static bool bitmap_get_opaque(void *bitmap) +{ + struct bitmap *bm = bitmap; + + if (bitmap == NULL) { + LOG("NULL bitmap!"); + return false; + } + + return bm->opaque; +} + +static int bitmap_get_width(void *bitmap) +{ + struct bitmap *bm = bitmap; + + if (bitmap == NULL) { + LOG("NULL bitmap!"); + return 0; + } + + return(bm->width); +} + +static int bitmap_get_height(void *bitmap) +{ + struct bitmap *bm = bitmap; + + if (bitmap == NULL) { + LOG("NULL bitmap!"); + return 0; + } + + return(bm->height); +} + +static size_t bitmap_get_bpp(void *bitmap) +{ + return 4; +} + +struct bitmap *bitmap_scale(struct bitmap *prescale, int width, int height) +{ + struct bitmap *ret = malloc(sizeof(struct bitmap)); + int i, ii, v, vv; + uint32_t *retpixdata, *inpixdata; /* 4 byte types for quicker + * transfer */ + if (ret == NULL) + return NULL; + + retpixdata = malloc(width * height * 4); + if (retpixdata == NULL) { + free(ret); + return NULL; + } + + inpixdata = (uint32_t *)prescale->pixdata; + ret->pixdata = (uint8_t *)retpixdata; + ret->height = height; + ret->width = width; + for (i = 0; i < height; i++) { + v = i * width; + vv = (int)((i * prescale->height) / height) * prescale->width; + for (ii = 0; ii < width; ii++) { + retpixdata[v + ii] = inpixdata[vv + (int) + ((ii * prescale->width) / width)]; + } + } + return ret; + +} + + +static nserror +bitmap_render(struct bitmap *bitmap, struct hlcache_handle *content) +{ + int width; + int height; + HDC hdc, bufferdc, minidc; + struct bitmap *fsbitmap; + struct redraw_context ctx = { + .interactive = false, + .background_images = true, + .plot = &win_plotters + }; + + width = min(content_get_width(content), 1024); + height = ((width * bitmap->height) + (bitmap->width / 2)) / + bitmap->width; + + LOG("bitmap %p for content %p width %d, height %d", + bitmap, content, width, height); + + /* create two memory device contexts to put the bitmaps in */ + bufferdc = CreateCompatibleDC(NULL); + if ((bufferdc == NULL)) { + return NSERROR_NOMEM; + } + + minidc = CreateCompatibleDC(NULL); + if ((minidc == NULL)) { + DeleteDC(bufferdc); + return NSERROR_NOMEM; + } + + /* create a full size bitmap and plot into it */ + fsbitmap = win32_bitmap_create(width, height, BITMAP_NEW | BITMAP_CLEAR_MEMORY | BITMAP_OPAQUE); + + SelectObject(bufferdc, fsbitmap->windib); + + hdc = plot_hdc; + plot_hdc = bufferdc; + /* render the content */ + content_scaled_redraw(content, width, height, &ctx); + plot_hdc = hdc; + + /* scale bitmap bufferbm into minibm */ + SelectObject(minidc, bitmap->windib); + + bitmap->opaque = true; + + StretchBlt(minidc, 0, 0, bitmap->width, bitmap->height, bufferdc, 0, 0, width, height, SRCCOPY); + + DeleteDC(bufferdc); + DeleteDC(minidc); + win32_bitmap_destroy(fsbitmap); + + return NSERROR_OK; +} + +static struct gui_bitmap_table bitmap_table = { + .create = win32_bitmap_create, + .destroy = win32_bitmap_destroy, + .set_opaque = bitmap_set_opaque, + .get_opaque = bitmap_get_opaque, + .test_opaque = bitmap_test_opaque, + .get_buffer = bitmap_get_buffer, + .get_rowstride = bitmap_get_rowstride, + .get_width = bitmap_get_width, + .get_height = bitmap_get_height, + .get_bpp = bitmap_get_bpp, + .save = bitmap_save, + .modified = bitmap_modified, + .render = bitmap_render, +}; + +struct gui_bitmap_table *win32_bitmap_table = &bitmap_table; |